OFFSET
1,1
COMMENTS
Column 2 of A295352.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 4*a(n-1) - 3*a(n-2) - 4*a(n-4) - a(n-5) + a(n-6).
Empirical g.f.: x*(3 - 4*x - 3*x^2 - 5*x^3 + x^5) / ((1 - 3*x + x^2)*(1 - x - x^2 - 2*x^3 - x^4)). - Colin Barker, Feb 26 2018
EXAMPLE
Some solutions for n=5:
..0..0. .0..1. .1..0. .1..1. .0..0. .1..0. .0..0. .1..0. .1..0. .0..0
..0..0. .0..0. .0..1. .1..1. .0..0. .0..0. .0..0. .0..1. .0..1. .0..0
..1..1. .0..0. .0..0. .0..0. .0..1. .1..1. .1..1. .1..0. .1..0. .1..0
..1..1. .0..0. .1..0. .0..1. .1..0. .1..1. .1..1. .0..0. .0..1. .0..0
..1..1. .0..1. .0..1. .0..0. .0..1. .0..0. .0..0. .0..1. .0..0. .0..0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 20 2017
STATUS
approved